I need a website developer to make some custom text functionality on my website

I have a website where customers can write a word or phrase (up to 50 letters) and this will be printed on a blanket. I need to create. 1. a free text box where people can write 2. i need each letter of the work/phrase to be able to be changed into 10 colors and 2 font sizes. 3. i need the word/phrase to be previewed on a blanket below the text box. I’m thinking there will be single independent text boxes with each letter in it under the text box so that customers can change each letter and size perhaps. then under this will be the preview image. happy to chat with someone about there thoughts. Im thinking to use shopify but haven’t committed to Shopify so if you have other ideas I’m happy to hear. i will create the website, i just need someone to create this one page. Thanks for your time to read.